is registered for treatment of Red Stele. Read all cautions and instructions related to application time and dose before applying.
Leather Rot is Caused by a soil inhabiting fungus and occurs on many plants. The fungus attacks berries in the field at all stages of development.
Fruit rot occurs when the berries come in contact with the soil. The fungus may also cause a serious crown rot, which can develop along with the fruit rot.
Strawberries will initially have brown spots on the berry itself, which gradually spreads to cover the entire berry, giving it a leathery appearance and foul odor. On ripe and ripening fruit, brown and purple spots and streaks develop, the fruit decays rendering it unpalatable.
Google Images - Leather Rot on Strawberries
Cultural controls for leather rot, once you have it, is like closing the barn door after the livestock has escaped. But it can help prevent or minimize subsequent occurrences. Leather rot requires splashing water, rain or excessively wet conditions to transport its spores to the fruit. Site selection, Mulching, soil aeration, the use of drip systems for irrigation and other common sense approaches to minimize the possibility of it becoming established, or further established as the case may be - are advisable.
Mulching, particularly plastic mulch, prevents the berries from coming into contact with the ground and minimizes rain splash, it will help control leather rot.
Commercial growers frequently use drip fumigation. This is not readily an option for home growers. The chemicals available to farmers are not always available to home growers.
The most commonly used active ingredient is chloropicrin which is a "Restricted Use" chemical. There are no resistant cultivars for leather rot and unfortunately for home gardeners - no real cure. Prevention is the best cure.
Chlorothalonil based fungicides are helpful in treatment.
Copper hydroxide and other copper based fungicides are also effective. Consult product labels before applying for dosage and application times.
Botrytis Fruit Rot, also known as Gray mold, is caused by spores produced on dead strawberry foliage. The fungus invades young strawberry leaves without producing any initial symptoms. As the leaf matures, the pathogen spreads quickly through the dying tissue . Spores are dispersed by air, water or harvesting and ultimately infect all parts of the plant. Bonide Remedy Fungicide is effective against against Botrytis Fruit Rot.
The fungus that causes Powdery Mildew appears as a grayish-white coating on the undersides of leaves. Leaf function is impaired but symptoms develop so late in the season that berry production is seldom affected. Bonide Remedy Fungicide is effective against Powdery Mildew.
See Also: University of California: Strawberry -Powdery Mildew
Insect Pests of Strawberries
Aphids cause strawberry yield losses due to honeydew production. Honeydew deposits on fruit cause sooty molds to develop. White skins shed by aphid nymphs stick to the berry which renders the fruit unpalatable.
Corn Earworm causes damage to strawberries by burrowing into the berry. Only larvae of the first generation attacks winter strawberries. Entrance holes made by early larvae aren't visible, and the fruit must be cut to determine their presence. Larvae typically feed in the air pocket at the strawberries center. Mature strawberries containing larger larvae appear seedy and develop a shrunken surface with brown patches
Strawberry Root Weevil, a snout beetle, feeds on the roots of strawberry plants and can completely devour small rootlets and destroy the bark and cortex of larger roots. Soon after feeding begins, plants wilt and either become less productive, cease to produce and~or die off.
Milky Spore is another weapon in the war against weevils , it is not harmful to beneficial insects, birds, bees, pets or man. The product is approved and registered with the EPA, Milky Spore will not affect wells, ponds or streams.
Bacillius thuringiensis [Bt] is somewhat effective against the larvae stages it should be applied as soon as the presence of adults is evident, to head off the imminent egg laying and hatched larvae.
Neem based Products, such as Azatin or Azadirachtin [extract of the neem seed-] prevents the larvae from developing normally and is also a good alternative for later larval stages. These products degenerate rapidly in nature and need to be reapplied frequently. For effective use mix Neem oil with equal parts of water and saturate the ground around the plants, allowing it to soak in thoroughly.
In severe infestations, there are a number of broad spectrum pesticides registered for use against weevil, sold under varying trade names.
Spider Mites will retard the growth of strawberry plants which can result In plant death. Most severe losses have resulted from outbreaks starting in late fall or winter.
In the spring, mites increase rapidly. They do the greatest damage during or after the blooming period.
Lady Bugs can help to contain infestations of mites
Sprays of rosemary oil are effective as well as non toxic.
Iron deficiency, or chlorosis, is common in excessively watered strawberries. It is characterized by pale, yellowed leaves with dark green veins. In severe cases, the edges of the leaves will dry up and turn brown. Yields are typically dismal. See: Nutrient Disorders in Vegetable Gardens
Water management is vital when growing plants in alkaline soils [high pH]. In excessively wet or poorly drained soils, the chemistry of the soil degrades in some aspects and iron is depleted. Excessive irrigation in heavy clay soils or in cool climates frequently leads to a deficiency of iron. Numerous iron compounds are commercially available for treating iron chlorosis but no single product has proven 100% successful in all situations. Furthermore strawberries do not always respond well to foliar sprays of iron.
If you notice symptoms of chlorosis, reduce the frequency of watering. If the condition persists, apply Iron sulfate using recommendations on the bag. Sequestrene will also do the trick.
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